''' 文件复制2 当文件过大时 '''


# f1 = open('note副本.txt','r',encoding="utf-8")
f1 = open('note副本.txt','rb')
# f2 = open('note副本+1.txt','w',encoding='utf-8',encoding='utf-8')
f2 = open('note副本+1.txt','wb')

while True:
    str = f1.read(20)
    if len(str) == 0:
        break
    f2.write(str)



f1.close()
f2.close()
